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제목: Interannual variability of the stratospheric hydrogen chloride simulated with SD-WACCM in recent years
연사: 박미정 박사 (NSF NCAR)
일시: 2024년 4월 25일 목요일 16:00 장소: 과학관 551호 Abstract: Monitoring long-term trends in stratospheric hydrogen chloride (HCl) is essential for predicting our climate as well as for ozone recovery. To better understand the changes in its concentration and the underlying physical processes in recent years, the specifieddynamics version of the Whole Atmosphere Community Climate Model (SD-WACCM) and the satellite measurements of HCl from NASA’s Aura Microwave Limb Sounder (MLS) are used in this study. The interannual variability of HCl in the Northern Hemisphere (NH) midlatitudes is influenced strongly by the stratospheric large-scale circulation and climate variability. For instance, the vertical wind shear associated with the stratospheric quasibiennial oscillation (QBO) can explain much of the year-to-year variability in HCl in NH midlatitude in winter months. However, this relationship seems to have weakened in recent years after the first disruption in the QBO in 2015-2016. Other sources of climate variability, such as sudden stratospheric warming (SSW) events could have played a role in the circulation that contributed to variability in HCl. Our results show that not only the changes in the surface emissions but also the large-scale circulation related to the climate variability in the stratosphere appear to have significant impact on the long-term trends of stratospheric HCl.
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